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EC21 Mini PCIe
Hardware Design
LTE Module Series
Rev. EC21_Mini_PCIe_Hardware_Design_V1.0
Date: 2016-06-07
www.quectel.com
LTE Module Series EC21 Mini PCIe Hardware Design
EC21_Mini_PCIe_Hardware_Design Confidential / Released 1 / 39
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assistance, please contact our company headquarters:
Quectel Wireless Solutions Co., Ltd.
Office 501, Building 13, No.99, Tianzhou Road, Shanghai, China, 200233
Tel: +86 21 5108 6236
Email: [email protected]
Or our local office, for more information, please visit:
http://www.quectel.com/support/salesupport.aspx
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http://www.quectel.com/support/techsupport.aspx
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Copyright © Quectel Wireless Solutions Co., Ltd. 2016. All rights reserved.
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About the Document
History
Revision Date Author Description
1.0 2016-06-07 Yeoman CHEN/
Frank WANG Initial
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Contents
About the Document ................................................................................................................................... 2
Contents ....................................................................................................................................................... 3
Table Index ................................................................................................................................................... 5
Figure Index ................................................................................................................................................. 6
1 Introduction .......................................................................................................................................... 7
1.1. Safety Information...................................................................................................................... 8
2 Product Concept .................................................................................................................................. 9
2.1. General Description ................................................................................................................... 9
2.2. Description of Product Series .................................................................................................. 10
2.3. Key Features ........................................................................................................................... 10
2.4. Functional Diagram ................................................................................................................. 13
3 Application Interface ......................................................................................................................... 14
3.1. General Description ................................................................................................................. 14
3.2. EC21 Mini PCIe Interface ........................................................................................................ 14
3.2.1. Definition of Interface ..................................................................................................... 14
3.2.2. Pin Assignment .............................................................................................................. 17
3.3. Power Supply ........................................................................................................................... 18
3.4. USIM Card Interface ................................................................................................................ 19
3.5. USB Interface .......................................................................................................................... 20
3.6. UART Interface ........................................................................................................................ 21
3.7. PCM and I2C Interface ............................................................................................................ 22
3.8. Control Signals ........................................................................................................................ 24
3.8.1. RI Signal ......................................................................................................................... 24
3.8.2. DTR Signal ..................................................................................................................... 25
3.8.3. W_DISABLE# Signal ...................................................................................................... 25
3.8.4. PERST# Signal .............................................................................................................. 25
3.8.5. LED_WWAN# Signal ..................................................................................................... 26
3.8.6. WAKE# Signal ................................................................................................................ 27
3.9. Antenna Interfaces .................................................................................................................. 27
4 Electrical and Radio Characteristics ............................................................................................... 29
4.1. General Description ................................................................................................................. 29
4.2. Power Supply Requirements ................................................................................................... 29
4.3. IO Requirements ...................................................................................................................... 30
4.4. RF Characteristics ................................................................................................................... 30
4.5. GNSS Receiver ....................................................................................................................... 32
4.6. ESD Characteristics ................................................................................................................ 33
5 Dimensions and Packaging .............................................................................................................. 34
5.1. General Description ................................................................................................................. 34
5.2. Mechanical Dimensions of EC21 Mini PCIe ............................................................................ 34
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5.3. Standard Dimensions of Mini PCI Express ............................................................................. 35
5.4. Packaging ................................................................................................................................ 36
6 Appendix References ........................................................................................................................ 37
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Table Index
TABLE 1: DESCRIPTION OF EC21 MINI PCIE ................................................................................................ 10
TABLE 2: KEY FEATURES OF EC21 MINI PCIE .............................................................................................. 11
TABLE 3: DEFINITION OF IO PARAMETERS .................................................................................................. 14
TABLE 4: DESCRIPTION OF PIN ..................................................................................................................... 15
TABLE 5: VCC_3V3 AND GND PIN DEFINITION ............................................................................................ 18
TABLE 6: USIM PIN DEFINITION ..................................................................................................................... 19
TABLE 7: USB PIN DEFINITION ....................................................................................................................... 20
TABLE 8: PIN DEFINITION OF THE UART INTERFACE ................................................................................. 21
TABLE 9: PCM AND I2C PIN DEFINITION ....................................................................................................... 22
TABLE 10: CONTROL SIGNAL PIN DEFINITION ............................................................................................ 24
TABLE 11: RADIO OPERATIONAL STATES ..................................................................................................... 25
TABLE 12: INDICATIONS OF NETWORK STATUS ......................................................................................... 26
TABLE 13: ANTENNA REQUIREMENTS .......................................................................................................... 27
TABLE 14: POWER SUPPLY REQUIREMENTS .............................................................................................. 29
TABLE 15: IO REQUIREMENTS ....................................................................................................................... 30
TABLE 16: CONDUCTED RF OUTPUT POWER ............................................................................................. 30
TABLE 17: EC21-E CONDUCTED RF RECEIVING SENSITIVITY .................................................................. 31
TABLE 18: EC21-A MINI PCIE CONDUCTED RF RECEIVING SENSITIVITY ................................................ 31
TABLE 19: EC21-V MINI PCIE CONDUCTED RF RECEIVING SENSITIVITY ................................................ 32
TABLE 20: EC21-AUT MINI PCIE CONDUCTED RF RECEIVING SENSITIVITY ........................................... 32
TABLE 21: EC21-AUTL MINI PCIE CONDUCTED RF RECEIVING SENSITIVITY ......................................... 32
TABLE 22: ESD CHARACTERISTICS .............................................................................................................. 33
TABLE 23: RELATED DOCUMENTS ................................................................................................................ 37
TABLE 24: TERMS AND ABBREVIATIONS ...................................................................................................... 37 Que
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Figure Index
FIGURE 1: FUNCTIONAL DIAGRAM ............................................................................................................... 13
FIGURE 2: PIN ASSIGNMENT ......................................................................................................................... 17
FIGURE 3: REFERENCE DESIGN OF POWER SUPPLY ............................................................................... 18
FIGURE 4: REFERENCE CIRCUIT OF THE 6-PIN USIM CONNECTOR ....................................................... 19
FIGURE 5: REFERENCE CIRCUIT OF USB INTERFACE .............................................................................. 20
FIGURE 6: TIMING OF PRIMARY MODE ........................................................................................................ 23
FIGURE 7: TIMING OF AUXILIARY MODE ...................................................................................................... 23
FIGURE 8: REFERENCE CIRCUIT OF PCM APPLICATION WITH AUDIO CODEC ...................................... 24
FIGURE 9: RI BEHAVIOR ................................................................................................................................. 25
FIGURE 10: TIMING OF RESETTING MODULE ............................................................................................. 26
FIGURE 11: LED_WWAN# SIGNAL REFERENCE CIRCUIT DIAGRAM ......................................................... 26
FIGURE 12: WAKE# BEHAVIOR ...................................................................................................................... 27
FIGURE 13: DIMENSIONS OF THE RF CONNECTOR (UNIT: MM) ............................................................... 28
FIGURE 14: MECHANICALS OF UF.L-LP CONNECTORS ............................................................................. 28
FIGURE 15: MECHANICAL DIMENSIONS OF EC21 MINI PCIE (UNIT: MM) ................................................. 34
FIGURE 16: STANDARD DIMENSIONS OF MINI PCI EXPRESS (UNIT: MM) ............................................... 35
FIGURE 17: DIMENSIONS OF THE MINI PCI EXPRESS CONNECTOR (UNIT: MM) ................................... 36
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1 Introduction
This document defines EC21 Mini PCIe module and describes its hardware interfaces which are
connected with your application and air interfaces.
This document can help you to quickly understand the interface specifications, electrical and mechanical
details and related product information of the EC21 Mini PCIe module. To facilitate its application in
different fields, relevant reference design documents are also provided. Associated with application notes
and user guide of EC21 Mini PCIe module, you can use the module to design and set up mobile
applications easily.
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1.1. Safety Information
The following safety precautions must be observed during all phases of the operation, such as usage,
service or repair of any cellular terminal or mobile incorporating EC21 Mini PCIe module. Manufacturers
of the cellular terminal should send the following safety information to users and operating personnel and
to incorporate these guidelines into all manuals supplied with the product. If not so, Quectel does not take
on any liability for customer failure to comply with these precautions.
Full attention must be given to driving at all times in order to reduce the risk of an
accident. Using a mobile while driving (even with a handsfree kit) cause distraction
and can lead to an accident. You must comply with laws and regulations restricting
the use of wireless devices while driving.
Switch off the cellular terminal or mobile before boarding an aircraft. Make sure it
switched off. The operation of wireless appliances in an aircraft is forbidden to
prevent interference with communication systems. Consult the airline staff about
the use of wireless devices on boarding the aircraft, if your device offers a Airplane
Mode which must be enabled prior to boarding an aircraft.
Switch off your wireless device when in hospitals or clinics or other health care facilities. These requests are desinged to prevent possible interference with sentitive medical equipment.
Cellular terminals or mobiles operate over radio frequency signal and cellular
network and cannot be guaranteed to connect in all conditions, for example no
mobile fee or an invalid SIM card. While you are in this condition and need
emergent help, please remember using emergency call. In order to make or
receive call, the cellular terminal or mobile must be switched on and in a service
area with adequate cellular signal strength.
Your cellular terminal or mobile contains a transmitter and receiver. When it is ON,
it receives and transmits radio frequency energy. RF interference can occur if it is
used close to TV set, radio, computer or other electric equipment.
In locations with potencially explosive atmospheres, obey all posted signs to turn
off wireless devices such as your phone or other cellular terminals. Areas with
potencially exposive atmospheres including fuelling areas, below decks on boats,
fuel or chemical transfer or storage facilities, areas where the air contains
chemicals or particles such as grain, dust or metal powders.
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2 Product Concept
2.1. General Description
EC21 Mini PCIe module provides data connectivity on FDD-LTE, WCDMA and GSM networks with PCI
Express Mini Card 1.2 standard interface. It supports embedded operating system such as WinCE, Linux
and Android etc., and also provides audio, high-speed data transmission and GNSS functionality for your
applications.
EC21 Mini PCIe module can be applied in the following fields:
PDAs and Laptop Computer
Remote Monitor System
Vehicle System
Wireless POS System
Intelligent Meter Reading System
Wireless Router and Switch
Other Wireless Terminal Device
This chapter generally introduces the following aspects of EC21 Mini PCIe module:
Product Series
Key Features
Functional Diagram
EC21 Mini PCIe contains Telematics version and Data-Only version. Telematics version supports voice
and data, while Data-Only version only supports data.
NOTE
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2.2. Description of Product Series
The following table shows the product series of EC21 Mini PCIe module.
Table 1: Description of EC21 Mini PCIe
1. 1)
GNSS function is optional.
2. 2)
Digital audio (PCM) function is only supported in Telematics version.
2.3. Key Features
The following table describes the detailed features of EC21 Mini PCIe module.
Product Series Description
EC21-E Mini PCIe
Support GSM: 900/1800MHz
Support WCDMA: B1/B5/B8
Support LTE FDD: B1/B3/B5/B7/B8/B20
Support LTE/WCDMA receive diversity
Support GNSS1)
Support digital audio2)
EC21-A Mini PCIe
Support WCDMA: B2/B5
Support LTE FDD: B2/B4/B12
Support LTE/WCDMA receive diversity
Support GNSS1)
Support digital audio2)
EC21-V Mini PCIe
Support LTE FDD: B4/B13
Support LTE receive diversity
Support GNSS1)
Support digital audio2)
EC21-AUT Mini PCIe
Support WCDMA: B1/B5
Support LTE FDD: B1/B3/B5/B7/B28
Support GNSS1)
Support digital audio2)
EC21-AUTL Mini PCIe Support LTE FDD: B3/B7/B28
Support digital audio2)
NOTES
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Table 2: Key Features of EC21 Mini PCIe
Feature Details
Function Interface PCI Express Mini Card 1.2 Standard Interface
Power Supply Supply voltage: 3.0~3.6V
Typical supply voltage: 3.3V
Transmitting Power
Class 4 (33dBm±2dB) for GSM900
Class 1 (30dBm±2dB) for DCS1800
Class E2 (27dBm±3dB) for GSM900 8-PSK
Class E2 (26dBm±3dB) for DCS1800 8-PSK
Class 3 (24dBm+1/-3dB) for WCDMA bands
Class 3 (23dBm±2dB) for LTE FDD bands
LTE Features Support up to non-CA CAT1
FDD: Max 5Mbps (UL), 10Mbps (DL)
WCDMA Features Support 3GPP R8 DC-HSPA+
Max 42Mbps (DL), Max 5.76Mbps (UL)
GSM Features
R99: CS data: 9.6k, 14.4kbps
GPRS: Support GPRS multi-slot class 12 (12 by default)
Coding scheme: CS-1, CS-2, CS-3 and CS-4
Maximum of four Rx time slots per frame
EDGE: Support EDGE multi-slot class 12 (12 by default)
Support GMSK and 8-PSK for different MCS (Modulation and
Coding Scheme)
Downlink coding schemes: CS 1-4, MCS 1-9
Uplink coding schemes: CS 1-4, MCS 1-9
Internet Protocol Features
Support TCP/UDP/PPP/FTP1)
/HTTP1)
/SMTP1)
/MMS1)
/NTP/PING/DTMF1)
/
FILE1)
/CMUX1)
/QMI protocols
Support the protocols PAP (Password Authentication Protocol) and CHAP
(Challenge Handshake Authentication Protocol) usually used for PPP
connections
SMS
Text and PDU mode
Point to point MO and MT
SMS cell broadcast
SMS storage: ME by default
USIM Interface Support USIM/SIM card: 1.8V, 3.0V
UART Interface Baud rate can reach up to 230400bps, 115200bps by default
Used for AT command
Audio Feature1)
Support one digital audio interface: PCM interface
GSM: HR/FR/EFR/AMR/AMR-WB
WCDMA: AMR/AMR-WB
LTE: AMR/AMR-WB
Support echo cancellation and noise suppression
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1. 1)
These functions are under development.
2. 2)
Within operating temperature range, the module is 3GPP compliant.
3. 3)
Within extended temperature range, the module remains the ability to establish and maintain a
voice, SMS, data transmission, emergency call, etc. There is no unrecoverable malfunction; there are
also no effects on radio spectrum and no harm to radio network. Only one or more parameters like
Pout might reduce in their value and exceed the specified tolerances. When the temperature returns
to normal operating temperature levels, the module is compliant with 3GPP specification again.
PCM Interface1)
Support 8-bit A-law, μ-law and 16-bit linear data formats
Support long frame sync and short frame sync
Support master and slave mode, but must be the master in long frame sync
USB Interface
Compliant with USB 2.0 specification (slave only), the data transfer rate
can reach up to 480Mbps
Used for AT command communication, data transmission, firmware
upgrade, software debugging and GNSS NMEA output
USB Driver: Windows XP, Windows Vista, Windows 7, Windows 8/8.1,
Window CE 5.0/6.0/7.0, Linux 2.6 or later, Android 2.3/4.0/4.2/4.4/5.0
Antenna Interface Include main antenna, diversity antenna and GNSS antenna
Rx-diversity Support LTE/WCDMA Rx-diversity
GNSS Features1)
Gen 8C of Qualcomm (GPS, GLONASS, BeiDou, Galileo, QZSS)
Protocol: NMEA 0183
AT Commands Compliant with 3GPP TS 27.007, 27.005 and Quectel enhanced AT
commands
Physical Characteristics Size: (51.0±0.1) × (30.0±0.1) × (4.9±0.2) mm
Weight: approx. 9.8g
Temperature Range Operation temperature range: -35℃ ~ +75℃2)
Extended temperature range: -40℃ ~ +85℃3)
Firmware Upgrade USB interface and DFOTA1)
RoHS All hardware components are fully compliant with EU RoHS directive
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2.4. Functional Diagram
The following figure shows the block diagram of EC21 Mini PCIe.
EC21
Module
PCM&I2C
Min
i PC
I Exp
ress
Inte
rface
USB
USIM
W_DISABLE#
PERST#
LED_WWAN#
Main
Antenna
Interface
VCC
Main
Antenna
VBAT
GNSS
Antenna
Interface
GNSS
Antenna
Boost
Circuit
Diversity
Antenna
Interface
Diversity
Antenna
WAKE#
UART
DTR
RI
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3 Application Interface
3.1. General Description
The physical connections and signal levels of EC21 Mini PCIe comply with PCI Express Mini CEM
specifications. This chapter mainly describes the following interface definition and application of EC21
Mini PCIe:
Power supply
USIM interface
USB interface
UART interface
PCM&I2C interface
Control signals
Antenna interface
3.2. EC21 Mini PCIe Interface
3.2.1. Definition of Interface
The following tables show the pin definition of EC21 Mini PCIe on the 52-pin application.
Table 3: Definition of IO Parameters
Type Description
IO Bidirectional input/output
DI Digital input
DO Digital output
OC Open collector
PI Power input
PO Power output
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Table 4: Description of Pin
Pin No. Mini PCI Express
Standard Name
EC21 Mini PCIe
Pin Name I/O Description Comment
1 WAKE# WAKE# OC Output signal can be used
to wake up the host.
2 3.3Vaux VCC_3V3 PI 3.3V DC supply
3 COEX1 RESERVED — Reserved
4 GND GND Mini Card ground
5 COEX2 RESERVED — Reserved
6 1.5V NC — —
7 CLKREQ# RESERVED — Reserved
8 UIM_PWR USIM_VDD PO Power source for the
USIM/SIM card
9 GND GND Mini Card ground
10 UIM_DATA USIM_DATA IO USIM/SIM data signal
11 REFCLK- UART_RX DI UART receive data Connect to
DTE’s TX
12 UIM_CLK USIM_CLK DO USIM/SIM clock signal
13 REFCLK+ UART_TX DO UART transmit data Connect to
DTE’s RX
14 UIM_RESET USIM_RST DO USIM/SIM reset signal
15 GND GND Mini Card ground
16 UIM_VPP RESERVED — Reserved
17 RESERVED RI DO Output signal can be used
to wake up the host.
18 GND GND Mini Card ground
19 RESERVED RESERVED — Reserved
20 W_DISABLE# W_DISABLE# DI Disable wireless communications
Pull-up, Active low
21 GND GND Mini Card ground
22 PERST# PERST# DI Functional reset to the card Active low
23 PERn0 UART_CTS DI UART clear to send Connect to
DTE’s RTS
24 3.3Vaux RESERVED — Reserved
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25 PERp0 UART_RTS DO UART request to send Connect to
DTE’s CTS
26 GND GND Mini Card ground
27 GND GND Mini Card ground
28 1.5V NC — —
29 GND GND Mini Card ground
30 SMB_CLK I2C_SCL DO I2C serial clock
Require
external
pull-up to
1.8V
31 PETn0 DTR DI Sleep mode control
32 SMB_DATA I2C_SDA IO I2C serial data
Require
external
pull-up to
1.8V
33 PETp0 RESERVED — Reserved
34 GND GND Mini Card ground
35 GND GND Mini Card ground
36 USB_D- USB_DM IO USB differential data (-)
37 GND GND Mini Card ground
38 USB_D+ USB_DP IO USB differential data (+)
39 3.3Vaux VCC_3V3 PI 3.3V DC supply
40 GND GND Mini Card ground
41 3.3Vaux VCC_3V3 PI 3.3V DC supply
42 LED_WWAN# LED_WWAN# OC
Active-low LED signal for
indicating the state of the
card
43 GND GND Mini Card ground
44 LED_WLAN# RESERVED — Reserved
45 RESERVED PCM_CLK* IO PCM clock signal
46 LED_WPAN# RESERVED — Reserved
47 RESERVED PCM_DOUT* DO PCM data output
48 1.5V NC — —
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1. The typical supply voltage is 3.3V.
2. Keep all NC, reserved and unused pins unconnected.
3. “*” means digital audio (PCM) function is only supported on Telematics version.
3.2.2. Pin Assignment
The following figure shows the pin assignment of EC21 Mini PCIe module. The top side contains EC21
module and antenna connectors.
PIN2
PIN52
BOT
PIN1
PIN51
TOP
Figure 2: Pin Assignment
49 RESERVED PCM_DIN* DI PCM data input
50 GND GND Mini Card ground
51 RESERVED PCM_SYNC* IO PCM frame sync
52 3.3Vaux VCC_3V3 PI 3.3V DC supply
NOTES
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3.3. Power Supply
The following table shows pin definition of VCC_3V3 pins and ground pins.
Table 5: VCC_3V3 and GND Pin Definition
The typical supply voltage of EC21 Mini PCIe is 3.3V. In the 2G networks, the input peak current may
reach to 2.7A during the transmitting time, therefore the power supply must be able to provide enough
current, and a bypass capacitor of no less than 470µF with low ESR should be used to prevent the
voltage from dropping.
The following figure shows a reference design of power supply. The precision of resistor R2 and R3 is 1%,
and the capacitor C3 needs a low ESR.
LDO_IN
C1 C2
MIC29302WU U1
IN OUT
EN
GN
D
AD
J
2 4
1 3 5
VCC_3V3
100nF C3
470uF
C4
100nF
R2
82K 1%
47K 1%
R3
470uF
470R
51K R4
R1
MCU_POWER
_ON/OFF 47K
4.7KR5
R6
C5 C6
33pF 10pF
TVS
D1
Figure 3: Reference Design of Power Supply
Pin No. Pin Name I/O Power Domain Description
2, 39, 41, 52 VCC_3V3 PI 3.0~3.6V 3.3V DC supply
4, 9, 15, 18, 21,
26, 27, 29, 34, 35,
37, 40, 43, 50
GND Mini Card ground
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3.4. USIM Card Interface
The following table shows the pin definition of the USIM card interface.
Table 6: USIM Pin Definition
EC21 Mini PCIe supports 1.8V and 3.0V USIM cards. The following figure shows the reference design of
the 6-pin USIM connector.
USIM_VDD
GND
USIM_RST
USIM_CLK
USIM_DATA22R
22R
22R
100nF
USIM Connector
GND
33pF 33pF33pF
VCC
RST
CLK IO
VPP
GND
GND
33pF
15KModule
USIM_VDD
Figure 4: Reference Circuit of the 6-Pin USIM Connector
In order to enhance the reliability and availability of the USIM card in your application, please follow the
criteria below in the USIM circuit design:
Keep layout of USIM card as close to the module as possible. Assure the length of the trace as less
than 200mm as possible.
Keep USIM card signal away from RF and power supply alignment.
Keep the width of ground and USIM_VDD no less than 0.5mm to maintain the same electric potential.
The decouple capacitor of USIM_VDD should be less than 1uF and must near to USIM connector.
Pin No. Pin Name I/O Power Domain Description
8 USIM_VDD PO 1.8V/3.0V Power source for the USIM/SIM card
10 USIM_DATA IO 1.8V/3.0V USIM/SIM data signal
12 USIM_CLK DO 1.8V/3.0V USIM/SIM clock signal
14 USIM_RST DO 1.8V/3.0V USIM/SIM reset signal
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To avoid cross-talk between USIM_DATA and USIM_CLK, keep them away from each other and
shield them with surrounding ground.
In order to offer good ESD protection, it is recommended to add TVS whose parasitic capacitance
should not be more than 50pF. The 22ohm resistors should be added in series between the module
and USIM card so as to suppress the EMI spurious transmission and enhance the ESD protection.
The 33pF capacitors are used for filtering interference of GSM850/EGSM900. Please note that the
USIM peripheral circuit should be close to the USIM card holder.
The pull-up resistor on USIM_DATA line can improve anti-jamming capability when long layout trace
and sensitive occasion are applied, and should be placed close to the connector.
3.5. USB Interface
The following table shows the pin definition of USB interface.
Table 7: USB Pin Definition
EC21 Mini PCIe is compliant with USB 2.0 specification. It can only be used as a slave device. Meanwhile,
it supports high speed (480Mbps) and full speed (12Mbps) mode. The USB interface is used for AT
command communication, data transmission, GNSS NMEA output, software debug and firmware
upgrade. The following figure shows the reference circuit of USB interface.
USB_DP
USB_DM
GND
USB_DP
USB_DM
GND
R1
R2
Close to Module
R3
R4
Test Points
ESD Array
NM_0R
NM_0R
0R
0R
Minimize this stub
Module MCU
Figure 5: Reference Circuit of USB Interface
Pin No. Pin Name I/O Description Comment
36 USB_DM IO USB differential data (-) Require differential impedance of 90Ω
38 USB_DP IO USB differential data (+) Require differential impedance of 90Ω Quecte
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In order to meet USB data line signal integrity, components R1, R2, R3 and R4 must be placed close to
the module, and then these resistors should be placed close to each other. The extra stubs of trace must
be as short as possible.
In order to ensure the USB interface design corresponding with the USB 2.0 specification, please comply
with the following principles:
It is important to route the USB signal traces as differential pairs with total grounding. The impedance
of USB differential trace is 90ohm.
Do not route signal traces under crystals, oscillators, magnetic devices and RF signal traces. It is
important to route the USB differential traces in inner-layer with ground shielding, and not only upper
and lower layer but also right and left side should be shielded.
If you use the USB connector, you should keep the ESD components as close to the USB connector
as possible. Pay attention to the influence of junction capacitance of ESD component on USB data
lines. Typically, the capacitance value should be less than 2pF.
Keep the ESD components as close as possible to the connector.
Keep USB data test points traces short to avoid noise coupled on USB data lines. If possible, reserve
0R resistor on these two lines.
There are three preconditions when enabling EC21 Mini PCIe to enter into the sleep mode:
1. Execute AT command AT+QSCLK=1 to enable the sleep mode. Refer to document [2].
2. DTR pin should be kept in high level (pull-up internally).
3. USB interface on Mini PCIe must be connected with your USB interface and please guarantee
USB devices are in the suspended state.
3.6. UART Interface
The following table shows the pin definition of the UART interface.
Table 8: Pin Definition of the UART Interface
Pin No. EC21 Mini PCIe Pin Name I/O Power Domain Description
11 UART_RX DI 3.3V UART receive data
13 UART_TX DO 3.3V UART transmit data
23 UART_CTS DI 3.3V UART clear to send
25 UART_RTS DO 3.3V UART request to send
NOTES
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The UART interface supports 9600, 19200, 38400, 57600, 115200 and 230400bps baud rate. The default
is 115200bps. This interface can be used for AT communication.
AT command AT+IPR is used to set the baud rate of the UART, and AT command AT+IFC is used to set
the hardware flow control (hardware flow control is disabled by default). Please refer to document [2] for
details.
3.7. PCM and I2C Interface
The following table shows the pin definition of PCM interface that can be applied in audio codec design.
Table 9: PCM and I2C Pin Definition
EC21 Mini PCIe provides one PCM digital interface, which supports 8-bit A-law and μ-law, 16-bit linear
data formats and the following modes:
Primary mode (short sync, works as either master or slave)
Auxiliary mode (long sync, works as master only)
In primary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; the PCM_SYNC falling edge represents the MSB. In this mode, PCM_CLK supports 128kHz,
256kHz, 512kHz, 1024kHz and 2048kHz. The following figure shows timing relationship in primary mode
with 8kHz PCM_SYNC and 2048kHz PCM_CLK.
Pin No. Pin Name I/O Power Domain Description
45 PCM_CLK IO 1.8V PCM clock signal
47 PCM_DOUT DO 1.8V PCM data output
49 PCM_DIN DI 1.8V PCM data input
51 PCM_SYNC IO 1.8V PCM frame sync
30 I2C_SCL DO 1.8V I2C serial clock, require external
pull-up to 1.8V
32 I2C_SDA IO 1.8V I2C serial data, require external
pull-up to 1.8V
NOTE
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PCM_CLK
PCM_SYNC
PCM_OUT
MSB LSB MSB
125us
1 2 256255
PCM_IN
MSBLSBMSB
Figure 6: Timing of Primary Mode
In auxiliary mode, the data is sampled on the falling edge of the PCM_CLK and transmitted on the rising
edge; while the PCM_SYNC rising edge represents the MSB. In this mode, PCM interface operates with a
128kHz PCM_CLK and an 8kHz, 50% duty cycle PCM_SYNC only. The following figure shows the timing
relationship in auxiliary mode with 8kHz PCM_SYNC and 128kHz PCM_CLK.
PCM_CLK
PCM_SYNC
PCM_OUT
MSB LSB
PCM_IN
125us
MSB
1 2 1615
LSB
Figure 7: Timing of Auxiliary Mode
Clock and mode can be configured by AT command, and the default configuration is master mode using
short sync data format with 2048kHz PCM_CLK and 8kHz PCM_SYNC. In addition, EC21 Mini PCIe’s
firmware has integrated the configuration on some PCM codec’s application with I2C interface. Refer to
document [2] about the command AT+QDAI for details.
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The following figure shows a reference design of PCM interface with external codec IC.
PCM_DIN
PCM_DOUT
PCM_SYNC
PCM_CLK
I2C_SCL
I2C_SDA
CodecModule
1.8V
2.2
K
2.2
K
BCLK
FS
DACIN
ADCOUT
SCLK
SDIN
BIA
S
MIC_BIAS
MIC+
MIC-
SPKOUT+
SPKOUT-
Figure 8: Reference Circuit of PCM Application with Audio Codec
3.8. Control Signals
The following table shows the pin definition of control signals.
Table 10: Control Signal Pin Definition
3.8.1. RI Signal
The RI signal can be used to wake up the host. When URC returns, there will be the following behavior on
the RI pin after executing AT command AT+QCFG=“risignaltype”,“physical”.
Pin No. Pin Name I/O Power Domain Description
17 RI DO 3.3V URC ring indication can be used to
wake up the host.
31 DTR DI 3.3V Sleep mode control.
20 W_DISABLE# DI 3.3V Disable wireless communications,
pull-up by default, active low.
22 PERST# DI 3.3V Functional reset to the card, active low.
42 LED_WWAN# OC — Active-low LED signal for indicating the
state of the Module.
1 WAKE# OC — Output signal can be used to wake up
the host.
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URC return
120 msHigh
Low
Figure 9: RI Behavior
3.8.2. DTR Signal
The DTR signal supports sleep control function, drive it to low level will wake up the module. AT command
AT+QCFG=“pwrsavedtr”,0 is used to disable the sleep control function.
3.8.3. W_DISABLE# Signal
EC21 Mini PCIe provides W_DISABLE# signal to disable wireless communications through hardware
operation. The following table shows the radio operational states of module. Please refer to document [2]
for related AT commands.
Table 11: Radio Operational States
3.8.4. PERST# Signal
The PERST# signal can be used to force a hardware reset on the card. You can reset the module by
driving the PERST# to a low level voltage within the time frame of 150~460ms and then release it. The
reset scenario is illustrated in the following figure.
W_DISABLE# AT Commands Radio Operation
High Level AT+CFUN=1 Enabled
High Level AT+CFUN=0
AT+CFUN=4 Disabled
Low Level
AT+CFUN=0
AT+CFUN=1
AT+CFUN=4
Disabled
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VIL ≤ 0.5V
VIH ≥ 2.3V
VCC_3V3
≥ 150ms
ResettingModule
StatusRunning
PERST#
Restart
≤ 460ms
Figure 10: Timing of Resetting Module
3.8.5. LED_WWAN# Signal
The LED_WWAN# signal of EC21 Mini PCIe is used to indicate the network status of the module, which
can absorb the current up to 40mA. According to the following circuit, in order to reduce the current of the
LED, a resistor must be placed in series with the LED. The LED is emitting light when the LED_WWAN#
output signal is active low.
LED_WWAN#VCC
R
Figure 11: LED_WWAN# Signal Reference Circuit Diagram
The following table shows the indications of network status of the LED_WWAN# signal.
Table 12: Indications of Network Status
LED_WWAN# Description
Low Level (Light on) Registered on network
High-impedance (Light off)
No network coverage or not registered
W_DISABLE# signal is in low level. (Disable the RF)
AT+CFUN=0, AT+CFUN=4
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3.8.6. WAKE# Signal
The WAKE# signal is an open collector signal which is similar with RI signal. But a host pull-up resistor
and AT command AT+QCFG=“risignaltype”,“physical” are required. When URC returns, there will be
120ms low level pulse output as below.
URC return
120 msHigh
Low
(external
pull-up)
Figure 12: WAKE# Behavior
3.9. Antenna Interfaces
EC21 Mini PCIe antenna interfaces include a main antenna interface, a Rx-diversity antenna interface
and a GNSS antenna interface.
Rx-diversity function is enabled by default. Use the AT command AT+QCFG=“diversity”,0 can disable
receive diversity.
The following table shows the requirement on main antenna, Rx-diversity antenna and GNSS antenna.
Table 13: Antenna Requirements
Type Requirements
GNSS
Frequency range: 1561 - 1615MHz
Polarization: RHCP or linear
VSWR: < 2 (Typ.)
Passive antenna gain: > 0dBi
GSM/WCDMA/LTE
VSWR: ≤ 2
Gain (dBi): 1
Max Input Power (W): 50
Input Impedance (ohm): 50
Polarization Type: Vertical
Cable Insertion Loss: < 1dB
(GSM900, WCDMA B5/B8, LTE B5/B8/B12/B13/B20/B28)
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Cable Insertion Loss: < 1.5dB
(GSM1800, WCDMA B1/B2, LTE B1/B2/B3/B4)
Cable insertion loss < 2dB
(LTE B7)
The following figure shows the overall sizes of RF connector.
Figure 13: Dimensions of the RF Connector (Unit: mm)
You can use U.FL-LP serial connector listed in the following figure.
Figure 14: Mechanicals of UF.L-LP Connectors
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4 Electrical and Radio Characteristics
4.1. General Description
This chapter mainly describes the following electrical and radio characteristics of EC21 Mini PCIe:
Power supply requirements
IO requirements
Current consumption
RF characteristics
GNSS receiver
ESD characteristics
4.2. Power Supply Requirements
The input voltage of EC21 Mini PCIe is 3.3V±9%, as specified by PCI Express Mini CEM Specifications
1.2. The following table shows the power supply requirements of EC21 Mini PCIe.
Table 14: Power Supply Requirements
Parameter Description Min. Typ. Max. Unit
VCC_3V3 Power Supply 3.0 3.3 3.6 V
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4.3. IO Requirements
The following table shows the IO requirements of EC21 Mini PCIe.
Table 15: IO Requirements
1. The PCM and I2C interface belong to 1.8V power domain, and other IO interfaces belong to VCC_3V3
power domain.
2. The maximum value of VIL for PERST# signal and W_DISABLE# signal is 0.5V.
4.4. RF Characteristics
The following tables show output power and receiving sensitivity of conducted RF of EC21 Mini PCIe
module.
Table 16: Conducted RF Output Power
Parameter Description Min. Max. Unit
VIH Input High Voltage 0.7 x VCC_3V3 VCC_3V3+0.3 V
VIL Input Low Voltage -0.3 0.3 x VCC_3V3 V
VOH Output High Voltage VCC_3V3-0.5 VCC_3V3 V
VOL Output Low Voltage 0 0.4 V
Frequency Max. Min.
EGSM900 33dBm±2dB 5dBm±5dB
DCS1800 30dBm±2dB 0dBm±5dB
EGSM900(8-PSK) 27dBm±3dB 5dBm±5dB
DCS1800(8-PSK) 26dBm±3dB 0dBm±5dB
WCDMA bands 24dBm+1/-3dB <-50dBm
LTE FDD bands 23dBm±2dB <-44dBm
NOTES
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Table 17: EC21-E Conducted RF Receiving Sensitivity
frequency Primary Diversity simo 3GPP (simo)
GSM -109dBm NA NA -102dBm
DCS -109dBm NA NA -102dbm
WCDMA Band1 -110.5dBm NA NA -106.7dBm
WCDMA Band5 -110.5dBm NA NA -104.7dBm
WCDMA Band8 -110.5dBm NA NA -103.7dBm
LTE-FDD B1(10M) -98.0dBm -98dBm -101.5dBm -96.3dBm
LTE-FDD B3(10M) -96.5dBm -98.5dBm -101.5dBm -93.3dBm
LTE-FDD B5(10M) -98dBm -98.5dBm -101dBm -94.3dBm
LTE-FDD B7(10M) -97dBm -94.5dBm -99.5dBm -94.3dBm
LTE-FDD B8(10M) -97dBm -97dBm -101dBm -93.3dBm
LTE-FDD B20(10M) -97.5dBm -99dBm -102.5dBm -93.3dBm
Table 18: EC21-A Mini PCIe Conducted RF Receiving Sensitivity
frequency Primary Diversity simo 3GPP (simo)
WCDMA B2 -110dBm NA NA -104.7dBm
WCDMA B4 -110dBm NA NA -106.7dBm
WCDMA B5 -110.5dBm NA NA -104.7dBm
LTE FDD B2 (10M) -98dBm -98dBm -101dBm -94.3dBm
LTE FDD B4 (10M) -97.5dBm -99dBm -101dBm -96.3dBm
LTE FDD B12 (10M) -94.5dBm -98dBm -101dBm -93.3dBm
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Table 19: EC21-V Mini PCIe Conducted RF Receiving Sensitivity
Frequency Primary Diversity simo 3GPP (simo)
LTE FDD B4 (10M) -97.5dBm -99dBm -101dBm -96.3dBm
LTE FDD B13 (10M) -95dBm -97dBm -100dBm -93.3dBm
Table 20: EC21-AUT Mini PCIe Conducted RF Receiving Sensitivity
Frequency Primary Diversity simo 3GPP (simo)
WCDMA Band1 -110dBm NA NA -106.7dBm
WCDMA Band5 -110.5dBm NA NA -104.7dBm
LTE-FDD B1(10M) -98.5dBm -98dBm -101dBm -96.3dBm
LTE-FDD B3(10M) -98dBm -96dBm -100dBm -93.3dBm
LTE-FDD B5(10M) -98dBm -99dBm -102.5dBm -94.3dBm
LTE-FDD B7(10M) -97dBm -95dBm -98.5dBm -94.3dBm
LTE-FDD B28(10M) -97dBm -99dBm -102dBm -94.8dBm
Table 21: EC21-AUTL Mini PCIe Conducted RF Receiving Sensitivity
Frequency Primary Diversity simo 3GPP (simo)
LTE-FDD B3(10M) -98dBm -96dBm -100dBm -93.3dBm
LTE-FDD B7(10M) -97dBm -95dBm -98.5dBm -94.3dBm
LTE-FDD B28(10M) -97dBm -99dBm -102dBm -94.8dBm
4.5. GNSS Receiver
EC21 Mini PCIe integrates a GNSS receiver that supports Gen8C-Lite of Qualcomm (GPS, GLONASS,
BeiDou, Galileo and QZSS), and could be used in Qualcomm gpsOneXTRA technology (one kind of
A-GNSS). This technology will download XTRA file from the internet server to enhance the TTFF. XTRA
file contains predicted GPS and GLONASS satellites coordinates and clock biases valid for up to 7 days.
It is best if XTRA file is downloaded every 1-2 days. Additionally, EC21 Mini PCIe can support standard
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NMEA-0183 protocol and output NMEA messages with 1Hz via USB NMEA interface.
EC21 Mini PCIe GNSS engine is switched off by default. You must switch on it by AT command. Please
refer to document [3] for more details about GNSS engine technology and configurations. In addition, it
should use passive antenna.
4.6. ESD Characteristics
The following table shows characteristics of EC21 Mini PCIe ESD.
Table 22: ESD Characteristics
Part Contact Discharge Air Discharge Unit
Power Supply and GND +/-5 +/-10 kV
Antenna Interface +/-4 +/-8 kV
USB Interface +/-4 +/-8 kV
USIM Interface +/-4 +/-8 kV
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5 Dimensions and Packaging
5.1. General Description
This chapter mainly describes the following dimensions of EC21 Mini PCIe:
Mechanical Dimensions of EC21 Mini PCIe
Standard Dimensions of Mini PCI Express
Packaging
5.2. Mechanical Dimensions of EC21 Mini PCIe
Figure 15: Mechanical Dimensions of EC21 Mini PCIe (Unit: mm)
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5.3. Standard Dimensions of Mini PCI Express
The following figure shows the standard Dimensions of Mini PCI Express. Please refer to document [1]
for detailed A and B.
Figure 16: Standard Dimensions of Mini PCI Express (Unit: mm)
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EC21 Mini PCIe adopts a standard Mini PCI Express connector which compiles with the directives and
standards listed in the document [1]. The following figure takes the Molex 679100002 as an example.
Figure 17: Dimensions of the Mini PCI Express Connector (Unit: mm)
5.4. Packaging
The EC21 Mini PCIe is packaged in tray. Each tray contains 10pcs of modules. The smallest package of
EC21 Mini PCIe contains 100pcs.
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6 Appendix References
Table 23: Related Documents
Table 24: Terms and Abbreviations
SN Document Name Remark
[1] PCI Express Mini Card Electromechanical
Specification Revision 1.2 Mini PCI Express Specification
[2] Quectel_EC21_AT_Commands_Manual EC21 AT Commands Manual
[3] Quectel_EC21_GNSS_AT_Commands_Manual EC21 GNSS AT Commands Manual
Abbreviation Description
AMR Adaptive Multi-rate
bps Bits Per Second
CS Coding Scheme
DC-HSPA+ Dual-carrier High Speed Packet Access
DFOTA Delta Firmware Upgrade Over The Air
DL Down Link
EFR Enhanced Full Rate
ESD Electrostatic Discharge
FDD Frequency Division Duplexing
FR Full Rate
GLONASS GLObalnaya Navigatsionnaya Sputnikovaya Sistema, the Russian Global
Navigation Satellite System
GMSK Gaussian Minimum Shift Keying
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GNSS Global Navigation Satellite System
GPS Global Positioning System
GSM Global System for Mobile Communications
HR Half Rate
HSPA High Speed Packet Access
HSUPA High Speed Uplink Packet Access
kbps Kilo Bits Per Second
LED Light Emitting Diode
LTE Long-Term Evolution
Mbps Million Bits Per Second
ME Mobile Equipment (Module)
MIMO Multiple-Input Multiple-Output
MMS Multimedia Messaging Service
MO Mobile Originated
MT Mobile Terminated
PCM Pulse Code Modulation
PDU Protocol Data Unit
PPP Point-to-Point Protocol
RF Radio Frequency
Rx Receive
USIM Universal Subscriber Identification Module
SMS Short Message Service
UART Universal Asynchronous Receiver & Transmitter
UL Up Link
URC Unsolicited Result Code
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WCDMA Wideband Code Division Multiple Access
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